I don't use Caltopo much on the website itself, but I've used it through various mediums throughout the years, including the Trail Guides and BCP Map. I reached out to Matt to use them for those things and he generously gave them to us for free. The only stipulation was that if the usage got too high, he'd need to charge us for the bandwidth. Incredibly generous. I think it's one of the best mapping solutions on planet earth and I'm happy to pay Matt $40+ a year even if I don't use it much. That mapping/programming genius deserves a healthy income for what he provides us map lovers. Where do I sign up?!